<!DOCTYPE html>
<html lang="zh">
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <title>Bootstrap实例</title>

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
    <!--<link rel="stylesheet" href="../../../libs/bootstrap4/css/bootstrap.css">-->

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
    <style>
        body>div{
            margin-bottom: 50px;
        }
        body {
            position: relative;
        }
        ul.nav-pills {
            top: 20px;
            position: fixed;
        }
        div.col-8 div {
            height: 500px;
        }
    </style>
</head>
<body data-spy="scroll" data-target="#myScrollspy" data-offset="1">

<div class="container-fluid">
    <div class="row">
        <nav class="col-sm-3 col-4" id="myScrollspy">
            <ul class="nav nav-pills flex-column">
                <li class="nav-item">
                    <a class="nav-link active" href="#section1">Section 1</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#section2">Section 2</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#section3">Section 3</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Section 4</a>
                    <div class="dropdown-menu">
                        <a class="dropdown-item" href="#section41">Link 1</a>
                        <a class="dropdown-item" href="#section42">Link 2</a>
                    </div>
                </li>
            </ul>
        </nav>
        <div class="col-sm-9 col-8">
            <div id="section1" class="bg-success">
                <h1>Section 1</h1>
                <p>Try to scroll this section and look at the navigation list while scrolling!</p>
            </div>
            <div id="section2" class="bg-warning">
                <h1>Section 2</h1>
                <p>Try to scroll this section and look at the navigation list while scrolling!</p>
            </div>
            <div id="section3" class="bg-secondary">
                <h1>Section 3</h1>
                <p>Try to scroll this section and look at the navigation list while scrolling!</p>
            </div>
            <div id="section41" class="bg-danger">
                <h1>Section 4-1</h1>
                <p>Try to scroll this section and look at the navigation list while scrolling!</p>
            </div>
            <div id="section42" class="bg-info">
                <h1>Section 4-2</h1>
                <p>Try to scroll this section and look at the navigation list while scrolling!</p>
            </div>
        </div>
    </div>
</div>

</body>
</html>